我正在运行连接到正常显示器的 Ubuntu（基本操作系统），该显示器工作正常。我现在正在尝试通过 HDMI 端口将其连接到电视，但电视无法获得任何信号。请帮帮我。
输出：sudo lshw -C display
*-display
description: VGA compatible controller
product: RS780L [Radeon 3000]
vendor: Hynix Semiconductor (Hyundai Electronics)
physical id: 5
bus info: pci@0000:01:05.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:18 memory:d0000000-dfffffff ioport:d000(size=256) memory:feaf0000-feafffff memory:fe900000-fe9fffff
xrandr 的输出：
\Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
VGA-0 connected 1366x768+0+0 (normal left inverted right x axis y axis) …